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Effect of Bentonite Modification with Glycerol on Adsorbent Structure and Physicochemical Characteristics

Abstract

The effect of targeted, glycerol-aided modification of natural clay mineral bentonite was studied in terms of changes in the structure and general properties of the adsorbent material. The modification was performed using natural bentonite with a high content of montmorillonite. The bentonite micro- and mesoporosity can be increased by introducing certain struts—pillars into the interlayer structure of aluminosilicates. The data on structural features and physicochemical properties of granular formed samples of adsorbents based on the original bentonite clay were compared to those of glycerol-modified ones. Specific surface area, porosity, volume, and pore size distribution values of the samples studied were measured using the sorption method and gas capillary condensation techniques. The structure of the samples was determined was determined with X-ray phase analysis, and their elemental composition was found with an energy dispersive spectrometer. It was proved that bentonite was modified by pyrolytic carbon resulting from decomposition of glycerol in an oxygen-free medium, in the course of annealing of pellets. The modified bentonite adsorbent had a 4-fold higher specific surface area value compared to the starting material with retention of the basic elemental composition.

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ACKNOWLEDGMENTS

We thank the director of scientific production enterprise LISSKON (Saratov) E.V. Skidanov for the opportunity to use its equipment for the obtainment of granular samples of sorptive material and for a productive discussion of the results.

Funding

This work was performed in terms of the RF Ministry of Science and Education Government task no. 5.3922.2017/6.4: “The development of ecologically safe power-efficient technologies of complex purification of water polluted as a result of natural and technogeneous emergencies for the stations of local water preparation in the RF problem regions.”

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Correspondence to A. V. Koshelev.

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We have no conflicts of interest to declare.

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Translated by P. Vlasov

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Koshelev, A.V., Tikhomirova, E.I. & Atamanova, O.V. Effect of Bentonite Modification with Glycerol on Adsorbent Structure and Physicochemical Characteristics. Russ. J. Phys. Chem. B 13, 1051–1056 (2019). https://doi.org/10.1134/S199079311906006X

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Keywords:

  • bentonite
  • montmorillonite
  • adsorption
  • glycerol
  • bentonite gel
  • granules
  • structure
  • interlayer space
  • platelet
  • specific surface of granules
  • physicochemical characteristics